I am downloading a time series of Sentinel 1 products.
Some products appear twice in the list, the only difference between them being the Product unique ID.
For example:
S1A_IW_GRDH_1SDV_20141221T181942_2014122T1822007_003821_004914_3107.safe
S1A_IW_GRDH_1SDV_20141221T181942_2014122T1822007_003821_004914_9592.safe
these two files correspond the GRDH Sentinel 1 data acquired on the same date at exactly the same time.
What is the difference between the two products?
Maybe @peter.meadows can answer when such things could occur.
It’s from 2014 early on in the mission. Maybe there was a problem fixes and reprocessed replacing the product.
Open both products and in the Abstracted Metadata check the processing date and processing facility of both.
It has been noticed that sometime duplicate products are processed. For your pair, please check the IPF version in the manifest files (e.g. <safe:software name=“Sentinel-1 IPF” version=“002.71”/>). If different, use the one with the higher version number, if the same use either.
Thank you very much!!
If I’m just looking at the XML results of a catalog search, what’s the best way to distinguish between duplicate scenes? The IPF version is not there - should I just take the one with the most recent ingestion date?
Eg, see S1A_EW_GRDM_1SDV_20160531T015455_20160531T015556_011496_011875_7869, S1A_EW_GRDM_1SDV_20160531T015455_20160531T015556_011496_011875_CF23 and S1A_EW_GRDM_1SDV_20160531T015455_20160531T015556_011496_011875_28D4
Since these products were processed with the same version of the processor (v2.71 installed on 11th May 2016) there will be no differences between the products. If you know the ingestion date then yes pick the most recent.